As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 500 HOUR INSPECTION ROTOR WAS VISUALLY INSPECTED AND A CRACK WAS OBSERVED BETWEEN KEYWAY FOR BLOCK GEAR DRIVE AND TOP OF MAGNETIC HOUSING. PART WAS REPLACED WITH NEW AND MAGNETO RETURNED TO SERVICE. ROTOR AND PICTURES WILL BE RETAINED AND ARE AVAILABLE.